Si's place is really nice and ideally located right next to Bang Chak BTS which gives quick access around Bangkok. The building has many lounges and facilities including swimming pool and gym. There's 24 hour security, and several staff are available at reception.
Si is quick to respond and a very helpful host. The studio room has a small kitchen for cooking, and the furnishings made for a cosy stay. You can also get a great view of Bangkok, since the room is on a high floor.
There are many shops and restaurants nearby including a 7-11 and Starbucks. There's also a shopping mall one stop away by train.
I stayed for over a month, and was very happy (ended up extending twice!).
Highly recommended.